Means for installing valve seats



Dec. 29, 1936.

R. BURSTON MEANS FOR INSTALLING VALVE .sm ws Filed Ma 14, 4954 AZZZZ/p F 5% Patented Dec. 29, 1936 UNITED STATES IATENT OFFICE S. FOR INSTALLING ,VALVE SEATS Richard Burston, Toronto, Ontario, Canada Application May 14, 1934, Serial No. 725,430

2 Claims.

" :ported .thereby in accordanceawith the operations :being, performed.

:The principalvfeaturecof the invention icon- :sistsin thenovel construction and arrangement of partswherebya lpair of'sleeve and spindle membersare provided; one of which is adapted-to be *securedin a rotatablezmachine spindle and either rotated .therebyor held rigidly in a fixed position,

while the otherthreaded member is adaptedto be a'rotatably interlocked with the Y first-mentioned member or:-berrotated-in relation to the first-men- -tioned'membergirn accordance with theparticular ."operation: to benperformed in the installing of the 'v'alvecseat.

InfithedrawingjFigure 1 is a mid-sectional-ele- Tiv'ationalwiew of-thedevice constructed in actcordancefwlth Ithe present invention showing l sameimountedina machine spindle in readiness to commence'tthe operation of "millingthe recess f toreceive the insert valve seat.

"Figure'i2 is an'elevational view of a portion of .a drill pressshowing my improved device mounted in the. spindle: thereof with the spindle about to be lowered toengage' the milling tool.

:tFigure'Bis a view-similar to-Figure'lbut showing the :spindle lowered for co-operation with the threadingttool and locked against rotation and axial movement.

Figure Ais a view of the structure shown in Figure 3 showing same in position having threaded a'renewal valve. seatinto place.

Inmy formerlUnited 'StatesPatent'No. 1,888,259,

"granted: November 22,1932, I disclose a method and means for installing valve seats. The-present inven'tion hasfcbeenindevised as an improvement thereover as to greatly facilitate the work required and to reduce to the minimum the manual labour required.

In my former patent above referred to the device was in the form of a bracket or jig which was required to be clamped to the engine block under treatment and manipulation of the device was a manual task which was slow and tedious. The present invention eliminates these difiiculties and provides aform of device whichcan be I mounted directly in a machine spindle.

According to the form of the inventionshown I provide a spindle I having-an-enlarged externally threaded portion 2 intermediate of its length [formed with an annular shoulder 3 beyond which a cylindrical concentric portion 4 extends, the other end of the spindle I being formed preferably as a tapered shank 5'to .fit the standard tapered orifice of-a drill press spindle E of a suit-= able drill press indicated in part in Figure 2. A flanged collar 1 is threaded onthe threaded portion. Z'of the spindle I and isgprovided with a sleeve extension 8 encircling the sleeve extension 4 ofthe spindle-in snug guiding c0ntact, ;the s1eeve 8 being shoulderedat'its upper end at 9-;to be engaged by the shoulder'3 .of the spindle sothat the spindle and" sleeve will be'rotatablyvlocked together during rotation ofthe machine spindle 5.

The bore H] of the sleeved is here shown :pro-

vided with a concentric guide bearing lining l l which is adapted to engage inguiding contact with a centering spindle l2, the-lower reduced end I3 of which isadapted to be inserted in the-valve guide M of an'engine block.

In the operation of the device; the engine block or head A will besuitably levelled on'a base plate l5 of a drill press, which plate will preferably be adjustable and suitable spacing blocks-ifimay be inserted under the head or block.

Theguide spindle I2 is then dropped into place in the'valve guide l4-and an end mill a. is then slipped over the upper guide end l2 as indicated in Figures 1 and 2.

By manipulation of the feed handle Won the drill press the spindle '6 thereof is then lowered so that the guide spindle l2 enters the guide sleeve ll of the spindle whileat the same time the driving lug projections 8' of the outer sleeve 8 are brought into engagement with the diamet-t rically opposite notches a formed in the-end mill as indicated in the dotted line position Figure 2 and asshown in detail in Figure 1. I

The drill spindle 6 is then rotated from alsuitable-source of powerwhile. the handle I1. is operated to feed the spindle downwardly; and since the shoulders 3 and 9 will be in engagementas shown in Figure 1, the sleeve 8 will rotate in unison with the machine spindle 6 and will be fed downwardly by the operation of the handle I! so that the end mill a will not only be rotated, but will be pressed axially so that the metal will be cut away and an annular recess is formed of a suitable depth and in true alignment with the valve guide.

means of a suitable locking clamp or other device indicated at l8, Figure' 3, in its locking position.

The collar flange I is provided with one or 7 more radial holes I and bar handles l9 are inserted therein by means of which the collar and extending sleeve portion 8 are-rotatedabout the rigidly held spindle I.

The pitch of the threads on the portion 2 corresponds with the pitch of the threads on the tap b so that as the sleeve 8- is rotated about the fixed spindle l the said sleeve will be threaded downwardly and will not only rotate the tapping die b but will positively feed same downwardly to effect a positive commencement of the threading operation so'that the wall of the annular milled orifice will be accurately and positively threaded.

On completion of the threading operation the collar 1 may then be rotated in the reverse direction to retract the threading die and the spindle locking device l8 may be swung upwardly to its unlocked position (Figure 2) and the machine spindle may be then raised as shown in the said Figure 2, whereupon the tapping die b may be removed. 7 r

The valve'seat c which is in the form of an extemallyzthreaded ring'is then placed over the guide spindle l2 and may be partially threaded by hand to start the thread, whereupon the machine spindle is again lowered and locked "by the member 18, a guide sleeve c'being prefer ably firstinserted below thesleeve 8 and the threaded seatmember c to form a positive drive connection therebetween as shown in Figured. Thus by rotating the collar flange 1 in themanner above defined the valve seat insert may be threaded very tightly in place.

To'finally finish ofi the upper surface .of the valve seat insert an end mill, similar to the end mill a, but of larger diametenmay then be placed over the guide spindle l2, and the machine spindle rotated with the parts asindicated'in Figure 1 to face off the upper surface of the valve seat insert.

It will thus be seen that the various operations are carried out with extreme accuracy while the device is accurately supported by-its'connection with the machine spindle so that no specialjigs are required to be bolted into place and the locking of the 'machine spindle against either rotation or axial movement brings the threading feature of the device into play. V

If desired the milling operation may be car-' ried out first in connection with the entire complement of valve seats to; be inserted, after which the threadmgop rations may be carried out successively.

The support I5 may be capable of any suitable adjustment to bring the valve guides into axial alignment with the machine spindles, and while I have defined'my device particularly in connec-* 'tion with a drill press having a rotatable and sliding spindle, I do not desire to be limited in this regard, since the support 15 may,if desired,

be the axially movable member during the millavailable.

-. What I claim as my invention is:-.

1. A device for installing valve seats comprising a spindle adapted to be rotatably mounted at one end and having an intermediate external threaded portion terminated in an annular shoulder, a collar threaded on. the threaded portion of said spindle and having an internal annular shoulder adapted to engage the aforesaid spindle shoulder to effect rotation of the two members in unison, said collar having a sleeve extension and said spindle having a cylindrical extension fitting snugly therein, means for gu1d-- ing the extremity of said sleeve and spindle extensions, means for effecting rotation of said collar on the spindle to threadedly separate the same axially during a machining operatiomand a machining tool associated with the sleeveexten-v sion of said collar.

2. In a device for engine block or head having a valve guide,'the

combination of a guide member to be inserted in the valve guide and having a guide head porinstalling valve seats in an tion extending centrally oi the valve seat, a

machining tool engageable inguiding contact with said guide head and adapted to beslipped over the upper end thereof without removal or said guide member, a tool driving member formed of inter-threaded axially adjustable parts, one of said inter-threaded parts having a portion to a "engage and rotatably interlock with the ma chine tool and the other of said inter-threaded parts having an axial guide bore extending in-. wardly from the lower end for a short distance to receive said guide head, means for'rotatably interlocking said inter-threaded parts, means r0- tatably mounting said tool driving member and being axially adjustable in one direction to move said respective inter-threaded parts concurrently into cooperative relation to said machining tool and guide head, and being adjustable in the reverse axial direction to clear the respective interthreaded members from the machining tool and guide head respectively to permit ready removal or insertion of the machining tool; said lastmentioned axially adjustable means being adapted to be locked to rigidly support the said axially bored threaded member at the end opposite to that engaging the guide head, and said tool engaging member threaded thereon being-thread edly rotatable on the said other member to perform a subsequent operation in the installing or the valve seat. RICHARD BURSTON. 

